Solenoid



Patented Apr. 22, 1947 SOLENOID William J. Christiansen, Teaneck, N. J assignor to Bendix Aviation Corporation, Teterboro, N. J a corporation of Delaware Application September 20, 1944, Serial No. 554,953

4 Claims.

My invention relates to electromagnetic apparatus, and more particularly to the mechanical construction thereof.

Electromagnets of the solenoid type are used extensively in installations of a character involving associated parts wherein vibrational and other disturbances are set up, which disturbances, when communicated to the solenoid assembly, tend to cause corresponding, but quite objectionable vibration and sometimes equally objectionable reciprocatory and/or rotary movements of the solenoid plunger with the result that the sleeve, in which the plunger is mounted, 7. becomes unduly worn within a relatively short period thereby necessitating replacement.

One of the objects of my invention is to pro vide a solenoid equipped with means for counteracting the aforementioned tendency and for controlling the eifect thereof upon the solenoid plunger whereby wear on the plunger sleeve is maintained at a minimum.

Another object of my invention is to provide a solenoid assembly wherein the inter-relationship, method of assembly, and the operation of the various components not only contribute to the construction of an extremely compact device but serve to preclude noise or chatter occasioned by vibration.

An important object of my invention is to provide a solenoid construction of the foregoing described character which is simple in construction,

durable in use, eflicient in operation, economical in manufacture and relatively silent when deenenglzed. M

With the above and other objects in view, as will hereinafter appear, the invention consists in the combination, and arrangement of parts hereinafter set forth and illustrated in the accompanying drawings, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

Referring to the drawing wherein like reference characters designate like parts throughout the several views,

Figure 1 is a longitudinal sectional view of a device embodying the invention.

Figure 2 is a detail longitudinal sectional view of the sleeve and plug.

Figure 3 is a sectional view taken on the line 3-3 of Figure 1.

Figure 4 is a view similar to Figure 2 but illustrating a modified form of sleeve.

In practicing my invention, as illustrated in Figures 1 to 3 inclusive of the drawing, I provide 2 a metallic shell or casing in provided at one end with an integral end wall II and formed at the opposite end with outwardly disposed flanges I2 to which are secured the flanges [3 of a plate or end wall M, the latter being formed with a centrally disposed opening IS. The casing l0 encloses therein an exciting coil l6 provided with metallic end members l1 and I8 respectively and with the end member l8 being disposed in electrical engagement with the casing having atached thereto one of the lead wires 19 of the coil whereby the lead wire is grounded to the casing. The other lead wire is secured to a binding post 20 carried by the other member ll and which binding post is insulated from the casing 10 and the end wall l3 by means of insulating material 2|.

The end wall II is centrally apertured and receives the inner end of a collar 22 formed. with a flange 23 secured to said wall by means of screws, one of the latter being illustrated at 24. Extending through the coil l6 and collar 22 is a nonmagnetic guide sleeve 25' having its inner end face abutting the end wall M. A pole-piece or plug 26 is fixed within the inner end section 21 of the guide sleeve and is provided with a radial face formed with a centrally disposed boss 28 fixed within the opening 15 and with teeth 29 marginating the boss and penetrating the end wall 14 whereby to preclude movement of the sleeve 25 and plug 26 relative to said coil l6 and casing l0.

The outer end section 30 of the sleeve 25, between the coil I 6 and collar 22, is formed with an outwardly disposed detent 3l' engaging the adjacent end member is of the coil and coasting with the plug 26 to maintain the coil IS in a fixed position within the casing 10. One side of the outer end section 30, outwardly of the collar, is formed with a slot 32 in which extends an angularly disposed end portion 33 of an in curvated leaf spring 34 disposed within the sleeve. The opposite side of said end section is deformed and fashioned with inwardly disposed means or a longitudinal rib 35 as clearly illustrated in Figure 3 of the drawing.

A movable pole-piece or magnetic plunger 36 is slidably mounted within the outer end section 30 of the sleeve and is formed on its circumferential face with a pair of oppositely disposed grooves 31 and 38 receiving said spring and rib respectively. A connecting member 39 in the form of a rod of nonmagnetic material slidably extends through the plug 26 and has its inner end disposed within a bore 40 formed in the plunger 36 and connected to the latter by means of a transverse pin H. The spring 34 engages the plunger 36 and coacts with the rib 35 to dampen vibratory movement of the plug relative to the sleeve when the coil is deenergized, while the rib coacts with the plunger to preclude rotation thereof relative to the sleeve when the coil is energized or deenergized.

The flanges l2 and I3 are provided with registering openings 42 for the reception of screws (not shown) whereby the solenoid may be secured to the housing of another device with which it may be operatively associated, for example, an engine starting mechanism of the character disclosed in Patent No. 1,833,948 granted to Raymond P. Lansing on December 4, 1931. In the latter instance, the plunger 38 is mechanically interlinked or connected with an engine-engaging clutch element and which element is shiftable in one direction by the plunger upon energization of the solenoid and in the opposite direction by spring means which also functions to operate the plunger in the opposite direction upon deenergization of the solenoid.

In the modified form illustrated in Figure 4, the outer end section 30 of the sleeve 25 is formed with inwardly disposed portions 45 which extend within the groove 38 of the plunger 36 in lieu of the rib 35 disclosed in Figures 1 to 3 inclusive.

Without further elaboration the foregoing will so fully explain the invention that others may, by applying current knowledge, readily adapt the same for use under various conditions of service. Moreover, it is not indispensable that all the features of the invention be used conjointly since they may be employed advantageously in various combinations and sub-combinations.

It is obvious that the invention is not confined to the herein described use therefor as it may be utilized for any purpose to which it is adaptable. It is therefore to be understood that the invention is not limited to the specific construction as illustrated and described as the same is only illustrative of the principles of operation, which are capable of extended application in various forms, and that the invention comprehends all construction within the scope of the appended claims.

What is claimed is:

1. In a construction of the class described, an exciting coil, a casing enclosing said coil and have an end wall formed with an opening, a nonmagnetic guide sleeve disposed within said coil, a magnetic plug disposed within one end of said sleeve and having a radial face formed with a boss fixed in said opening and with teeth penetrating said end wall adjacent said opening to maintain said plug fixed to said casing, a magnetic plunger slidably mounted within the other end of said sleeve, one side of said other end of said sleeve being formed with a slot and an outwardly disposed detent engaging the adjacent end of said coil and coacting with said plug to maintain said coil in a fixed position within said casing, the opposite side of said end being fashioned with an inwardly disposed rib, an incurvated leaf spring within said other end of said sleeve and formed with an end portion disposed in said slot for anchoring said spring to said sleeve, the circumferential face of said plunger being formed with oppositely disposed longitudinal grooves receiving said spring and rib respectively and with the spring engaging said plunger and coacting with said rib to dampen vibratory movement of said plug relative to said sleeve while said coil is deenergized, said rib coacting with said plunger to preclude rotation thereof relative to said sleeve during ener gization and deenergization of said coil.

2. In a construction of the class described, an exciting coil, a nonmagnetic guide sleeve disposed within said coil and having one end formed with an inwardly disposed longitudinal rib, a magnetic plug fixed within the other end of said sleeve, a magnetic plunger slidably mounted within said first mentioned end of said sleeve, a leaf spring retained within said sleeve and oppositely disposed from rib, the circumferential face of said plunger being formed with oppositely disposed longitudinal grooves receiving said spring and rib respectively and with the spring engaging said plunger and coacting with said rib to dampen vibratory movement of said plug relative to said sleeve while said coil is deenergized, said rib coacting with said plunger to preclude rotation thereof relative to said sleev during energization and deenergization of said coil.

3. An improvement in a solenoid construction of the type provided with a nonmagnetic guide sleeve disposed within the exciting coil and a magnetic plunger slidably mounted within one end of said sleeve, said improvement comprising said sleeve and plunger being modified and with one end of said sleeve being formed with inwardly disposed means, a leaf spring retained within said end of said sleeve, the circumferential face of said plunger being formed with oppositely disposed longitudinal grooves receiving said spring and means respectively and with the spring engaging said plunger and coacting with said means to' dampen vibratory movement of said plunger relative to said sleeve while said coil is deenergized, said means coacting with said plunger to preclude rotation thereof relative to said sleeve during energization and-deenergization of said coil. 1

4. In a construction of the class described, an exciting coil, a casing enclosing said col and having an end wall formed with an opening, a nonmagnetic guide sleeve extending through said coil, a magnetic plug fixed within one end section Number of said sleeve, said plug having a radial face formed with a boss fixed in said opening and with teeth penetrating said end wall adjacent said opening to maintain said plug fixed to said casing, the other end section of said sleeve being formed with an outwardly disposed detent engaging the adjacent end of said coil and coacting with said plug to maintain said coil in a fixed position within said casing.

WILLIAM J. CHRISTIANSEN.

REFERENCES CITED The following references are of record in the Name Date 2,239,312 Berges Apr. 22, 1941 

